//
// SiteMembershipCondition.cs: Site MembershipCondition
//
// Author:
//	Sebastien Pouliot  <sebastien@ximian.com>
//
// (C) 2004 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System.Collections;
using System.Globalization;

namespace System.Security.Policy {

	[Serializable]
	public sealed class SiteMembershipCondition : IMembershipCondition, IConstantMembershipCondition {

		private readonly int version = 1;

		private string _site;

		// constructors

		// so System.Activator.CreateInstance can create an instance...
		internal SiteMembershipCondition ()
		{
		}

		public SiteMembershipCondition (string site)
		{
			Site = site;
		}

		// properties

		public string Site { 
			get { return _site; }
			set {
				if (value == null)
					throw new ArgumentNullException ("site");
				if (!System.Security.Policy.Site.IsValid (value))
					throw new ArgumentException ("invalid site");
				_site = value;
			}
		}

		// methods

		public bool Check (Evidence evidence) 
		{
			if (evidence == null)
				return false;

			IEnumerator e = evidence.GetHostEnumerator ();
			while (e.MoveNext ()) {
				if (e.Current is Site) {
					string[] s1 = _site.Split ('.');
					string[] s2 = (e.Current as Site).origin_site.Split ('.');
					for (int i = s1.Length - 1, j = s2.Length - 1; i>=0; i--, j--) {
						if (i == 0) {
							// special * case
							return (String.Compare (s1 [0], "*", true, CultureInfo.InvariantCulture) == 0);
						}
						if (String.Compare (s1 [i], s2 [j], true, CultureInfo.InvariantCulture) != 0)
							return false;
					}
					return true;
				}
			}
			return false;
		}
		
		public IMembershipCondition Copy () 
		{
			return new SiteMembershipCondition (_site);
		}

		public override bool Equals (object o) 
		{
			if (o == null)
				return false;
			if (o is SiteMembershipCondition) {
				Site s = new Site ((o as SiteMembershipCondition)._site);
				return s.Equals (new Site (_site));
			}
			return false;
		}

		public void FromXml (SecurityElement e) 
		{
			FromXml (e, null);
		}

		public void FromXml (SecurityElement e, PolicyLevel level) 
		{
			MembershipConditionHelper.CheckSecurityElement (e, "e", version, version);
			_site = e.Attribute ("Site");
			// PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
		}

		public override int GetHashCode () 
		{
			return _site.GetHashCode ();
		}

		public override string ToString () 
		{
			return "Site - " + _site;
		}

		public SecurityElement ToXml () 
		{
			return ToXml (null);
		}

		public SecurityElement ToXml (PolicyLevel level) 
		{
			// PolicyLevel isn't used as there's no need to resolve NamedPermissionSet references
			SecurityElement se = MembershipConditionHelper.Element (typeof (SiteMembershipCondition), version);
			se.AddAttribute ("Site", _site);
			return se;
		}
	}
}